Fan bearing 3680: clearance cut without teardown, unit left in service

Bearing clearance tightened, the worn surface layer rebuilt, the fan stayed in service. Fan No. 1, bearing 3680, Rumyantsev Mine State Enterprise.

Rumyantsev Mine State Enterprise, Artemugol State Holding Company · treatment performed by XADO BC LLC, Donetsk — General Director P. V. Nasedkin

Gorlovka, Ukraine · contract No. 267 of 08.11.2000 · treatment from 15.12.2000 · act of 16.04.2001

PRODUCTXADO compoundtreatment per the XADO process chart · 2700 ml per bearing

TREATED UNITBearing No. 2 of fan No. 1type 3680 · low-speed unit, 300 rpm

DOCUMENT TYPEAct on the results of treatment
with the seals of the mine and the contractor

Key result

↓16-24%

bearing radial clearance, 0.29-0.31 → 0.22-0.26 mm

EQUIPMENT	CONDITION AT THE START OF WORK	WHAT WAS MEASURED
Fan No. 1, bearing No. 2 of type 3680	Radial clearance 0.29-0.31 mm, unit in operation, rotation speed 300 rpm	Radial clearance after 240 h and 720 h of operation

Radial clearance of bearing No. 2 of fan No. 1

STAGE	OPERATING TIME	RADIAL CLEARANCE
Before treatment	—	0.29-0.31 mm
After the first cycle (3 stages of 8 h, 1350 ml)	240 h	0.28-0.30 mm
After additional treatment (stage duration tripled)	720 h	0.22-0.26 mm

The mode for the low-speed unit was agreed with the manufacturer: the dosage stayed the same, the stage duration was tripled. Consumption per bearing — 2700 ml.

Findings of the act

Over 720 h of operation the radial clearance of bearing No. 2 of fan No. 1 decreased from 0.29-0.31 mm to 0.22-0.26 mm. The unit was restored in place — without disassembly, without replacing the bearing and without taking the fan out of service. On a low-speed unit (300 rpm) the standard process chart required tripling the treatment duration: the mode was agreed with the manufacturer and recorded in the act.

The commission recorded: «The reduction of radial clearances indicates restoration of the damaged surface layer of the bearing and the possibility of its further operation. The positive results achieved indicate the effectiveness of applying XADO technology on industrial equipment, including in the coal industry».

The results relate to a type 3680 bearing of a low-speed mine fan (300 rpm); on other units and operating modes the figures may differ. The original act with signatures and seals is published in full and available for download.

Current equivalent

Revitalizant gel for compressors and bearings →

Piston, screw and centrifugal compressors; rolling and sliding bearings running in an oil bath; machine-tool spindle units and slideways.

How such units are treated: Bearings

← Full catalogue